arch/arm/crypto/aes_glue.c

   1 /*
   2  * Glue Code for the asm optimized version of the AES Cipher Algorithm
   3  */
   4
   5 #include <linux/module.h>
   6 #include <linux/crypto.h>
   7 #include <crypto/aes.h>
   8
   9 #include "aes_glue.h"
  10
  11 EXPORT_SYMBOL(AES_encrypt);
  12 EXPORT_SYMBOL(AES_decrypt);
  13 EXPORT_SYMBOL(private_AES_set_encrypt_key);
  14 EXPORT_SYMBOL(private_AES_set_decrypt_key);
  15
  16 static void aes_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  17 {
  18         struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
  19         AES_encrypt(src, dst, &ctx->enc_key);
  20 }
  21
  22 static void aes_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
  23 {
  24         struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
  25         AES_decrypt(src, dst, &ctx->dec_key);
  26 }
  27
  28 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
  29                 unsigned int key_len)
  30 {
  31         struct AES_CTX *ctx = crypto_tfm_ctx(tfm);
  32
  33         switch (key_len) {
  34         case AES_KEYSIZE_128:
  35                 key_len = 128;
  36                 break;
  37         case AES_KEYSIZE_192:
  38                 key_len = 192;
  39                 break;
  40         case AES_KEYSIZE_256:
  41                 key_len = 256;
  42                 break;
  43         default:
  44                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
  45                 return -EINVAL;
  46         }
  47
  48         if (private_AES_set_encrypt_key(in_key, key_len, &ctx->enc_key) == -1) {
  49                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
  50                 return -EINVAL;
  51         }
  52         /* private_AES_set_decrypt_key expects an encryption key as input */
  53         ctx->dec_key = ctx->enc_key;
  54         if (private_AES_set_decrypt_key(in_key, key_len, &ctx->dec_key) == -1) {
  55                 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
  56                 return -EINVAL;
  57         }
  58         return 0;
  59 }
  60
  61 static struct crypto_alg aes_alg = {
  62         .cra_name               = "aes",
  63         .cra_driver_name        = "aes-asm",
  64         .cra_priority           = 200,
  65         .cra_flags              = CRYPTO_ALG_TYPE_CIPHER,
  66         .cra_blocksize          = AES_BLOCK_SIZE,
  67         .cra_ctxsize            = sizeof(struct AES_CTX),
  68         .cra_module             = THIS_MODULE,
  69         .cra_list               = LIST_HEAD_INIT(aes_alg.cra_list),
  70         .cra_u  = {
  71                 .cipher = {
  72                         .cia_min_keysize        = AES_MIN_KEY_SIZE,
  73                         .cia_max_keysize        = AES_MAX_KEY_SIZE,
  74                         .cia_setkey             = aes_set_key,
  75                         .cia_encrypt            = aes_encrypt,
  76                         .cia_decrypt            = aes_decrypt
  77                 }
  78         }
  79 };
  80
  81 static int __init aes_init(void)
  82 {
  83         return crypto_register_alg(&aes_alg);
  84 }
  85
  86 static void __exit aes_fini(void)
  87 {
  88         crypto_unregister_alg(&aes_alg);
  89 }
  90
  91 module_init(aes_init);
  92 module_exit(aes_fini);
  93
  94 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm (ASM)");
  95 MODULE_LICENSE("GPL");
  96 MODULE_ALIAS_CRYPTO("aes");
  97 MODULE_ALIAS_CRYPTO("aes-asm");
  98 MODULE_AUTHOR("David McCullough <ucdevel@gmail.com>");